| 摘要 |
PURPOSE:To prevent a room lamp from remaining lighted for a long time in a device for lighting the room lamp by the operation of the door handle, by keeping lighting the room lamp for a prescribed time after a door handle is pulled up and returned. CONSTITUTION:When a door handle is pulled up, a handle switch 4 is closed and an electrical current flows from a positive side through a circuit comprising a capacitor C, a resistor R1, a switch 4 and the ground, and the capacitor C is charged. At the same time, an electrical current flows through a circuit comprising a transistor Q1, a resistor R2, the switch 4 and the ground, and the transistor Q1 is turned on. When the door handle is returned, the switch 4 is opened and the capacitor C is discharged through the transistor Q1 and the resistor R1, R2 and the transistor Q1 remains turned on until the end of the discharge. At that time, transistors Q2, Q3, Q4 are sequentially turned on to cause a current to flow through a room illumination lamp 7 to light it. The lighting is continued until the end of the discharge of the capacitor C. |
